1) No.
2) The resonance frequency and gain associated with the 2 sided plenum would be different from a 3 sided plenum, whether deemed superior or inferior would depend on your desired outcome.
The stiffness of the enclosure as shown would be less in the 2 sided compared to a 3 sided, generally "inferior".
The tendency to place objects on top of horizontal surfaces would generally result in the 2 sided plenum eventually becoming three sided, so I'd be inclined to design for that inevitability, and also avoid the problem of unwanted items falling/spilling into the vibrating hole by building 3 sided from the start.
The desired position would be vertical (had to take a photo of the screen since I'm at work - and which resulted in an image rotated to landscape rather than portrait mode).
Good catch re. stiffness. I guess a brace at the front of the plenum could partly address that issue.
Here's what I'm thinking (since I have all the parts lying around:
A compact vertical PPSL featuring
- PPSL / passive radiator
- about 3 cuft +/- a bit total internal volume
- application: music - home theater / music
- vertical orientation to minimize floor space
- horizontal drivers (2 x dayton RSS265HF) connected in parallel @ 2 ohm
- driven by an INuke DSP
- a horizontal plenum
- 4 12" passive radiators , 2 per driver, along the front walls of the cab
- Passive radiator cutouts serve double duty to access and install drivers
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Over a quarter pound of weight (120g Mms) hanging on a fairly loose suspension is a good recipe for cone sag. I'd suggest a vertical plenum unless you plan to flip the cabinet before sag becomes a problem.
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I like your idea 🙂 So much so I've been working on a similar build 😀
But mine is designed to be modular, where I can use subs singularly, then stack them for push-push, and put them in corner if additional plenum effect and corner loading is desired.
First coupler try may be a little short, since I'm trying to run both direct radiator and ports through the slot.
They sound great stacked, but I'm not getting a full +6dB coupling like I get when they are side by side.
Getting there...
I say go for it...make it where you can either rotate drivers or turn whole box upside down if you are concerned with cone sag.
But mine is designed to be modular, where I can use subs singularly, then stack them for push-push, and put them in corner if additional plenum effect and corner loading is desired.
First coupler try may be a little short, since I'm trying to run both direct radiator and ports through the slot.
They sound great stacked, but I'm not getting a full +6dB coupling like I get when they are side by side.
Getting there...
I say go for it...make it where you can either rotate drivers or turn whole box upside down if you are concerned with cone sag.
Attachments
Yep. One cool thing is that you can go up, forward, down, or rear-firing without inducing sag. Down, naturally, has the advantage of driver protection and some additional low-pass characteristics, never a bad thing for a sub (unless you give it 1" clearance and make a tuned bandpass).